drying up the lake and ephemeral stream

alkali flat arid lakes aridization climate bog reversal climatic change desiccation dirt drought dry spell drying ecological turnover ephemeral impounded body lake river exsiccation fen grime intermittent stream marsh marshland mire morass muck mud muddy water ooze oozy quagmire silt slikke slough sludge spruit swamp temporary warpland weather modification wetland mud